Yeah that was the other option I was thinking of! Either way, I'm thinking there's some forces at play that caused him to "return" to after he wakes up from the accident with no memory as OG Maythan, however it is the story spins it to be. Whether his life in our universe happens first or midway through!
I 1000% believe he's the Fate Stone as it says about it "changing fate" and "roaming" as if it can physically walk around and Maythan can't find it because it is him and it's why he was able to move through different universes and has already changed the plot. I think calling it a stone is just a sort of a fairytale metaphor/pseudonym for whatever Maythan is and the true meaning of what the stone is was lost to time/fictionalized enough that everyone believes it to just be a real stone.
Haha It's just been sitting in my mind for so long and I feel like the last mention of the Fate Stone a couple chapters ago and this sort of admission of guilt to Carsen is just adding more credibility to it. I just had to drop the theory here and blow some minds LMAO
It also just feels wrong to try to not make them the same person when there's this backstory between Maythan and Carsen that ties them together pretty heavily.
I've been thinking this for a while, but I think (or at least very much hope) that Maythan is the original Maythan. There isn't much to back it up, but they have similiar personalities/attitudes, look the same, and he has a trauma response to a situation that is similar to what happens when he was attacked before losing his memory. Also it feels strange to have that personal connection to Carsen just taken away.
What if he was the OG Maythan and when he had the accident his soul traveled to our universe, lived an entire life without knowing who he was, and then returned to the moment of his accident.
It's clear that Maythan has a special power and I think he himself is the "Fate Stone" and is able to change fate through the knowledge he learned from his other life along with his power.